7500
Unlawful interference
A threat to the aircraft. Confirmed carefully, then handled by the authorities.
Emergency codes
What does squawk 7500 mean?
Squawk 7500 means unlawful interference. The crew is telling air traffic control, silently, that the aircraft is under threat, including a hijack. It is the most serious of the three emergency codes, and the rarest.
Because the code is visible on public trackers, a 7500 can spread online within seconds. Some turn out to be a wrong code entered by mistake, which is why controllers confirm it carefully before anyone acts.
Unlawful interference
Why there is a silent code for a threat
A crew under threat may not be able to say so on the radio, where anyone on board or on the frequency could hear. The squawk code is set on a small panel in the cockpit and appears on every radar screen in range, so it lets the crew raise the alarm without saying a word.
7500 means the same thing in every country. It is one of three codes held back worldwide so they are never given to an ordinary flight: 7500 for unlawful interference, 7600 for radio failure and 7700 for a general emergency.
The first minutes
How controllers confirm a 7500
A controller who sees 7500 does not announce it. They ask the crew, calmly, to confirm the code they are squawking. A crew that entered it by mistake corrects it at once. A crew that keeps 7500 is treated as confirming the threat, without having to say more.
From there the response is handled by the authorities, not air traffic control alone. Military aircraft may be sent to shadow the flight, and the aircraft may be directed to an airport chosen for these situations. In the UK, that is usually London Stansted.
In practice
Why a 7500 on a tracker is often a mistake
Real hijackings are extremely rare today. Mistyped codes are not. On older transponders, turning the knobs to a new code can briefly pass through 7500, and on any panel the code can be entered in error. The moment it is broadcast, trackers and social media can pick it up.
That is why a single 7500 on a map is not news on its own. Most are corrected within seconds. If one persists and the flight diverts, the story will come from the airline and the authorities, not from the tracker.
- check_circleA brief 7500 that disappears quickly is usually a code entry error.
- check_circleA 7500 that stays on, with a diversion, is treated with complete seriousness.
- check_circleAvoid sharing speculation about a specific flight. People on board have families watching too.
The other two
How 7500 differs from 7600 and 7700
7700 is the general emergency, used for technical problems, medical emergencies and fuel, and it is the one you are most likely to see. 7600 means the radio has failed and the crew will follow a published procedure.
What does squawk 7700 mean? and what does squawk 7600 mean? explain them in full.
7600
Radio failure
No radio contact. The aircraft is usually flying normally.
7700
General emergency
Technical, medical or fuel. Often ends in a safe diversion.
On the desk
How FlightAbove shows a squawk 7500
FlightAbove names emergency squawks on a red card with what the code means. It waits until the code has been seen twice in a row, which filters out many single mistyped or garbled reads. You choose whether to hear about emergency squawks inside your range only, or anywhere.
This is for people who watch aircraft. It is not a distress service and does not alert anyone. Recent 7500, 7600 and 7700 reports are listed on recent squawk alerts.
Hardware from £99.00, paid once, made in the UK
Quick answers
Questions about squawk 7500
What does squawk 7500 mean?
Unlawful interference, including a hijack. The crew sets it on the transponder so controllers know the aircraft is under threat without anyone having to say so on the radio.
Is every squawk 7500 a hijack?
No. Some are a code entered by mistake and corrected within seconds. Controllers confirm the code discreetly before anything else happens.
What happens when a plane squawks 7500?
The controller asks the crew to confirm the code. If it stays on, the authorities take over: military aircraft may shadow the flight, and it may be directed to an airport chosen for these situations.
Where do hijacked planes land in the UK?
Usually London Stansted, which is set up to handle these situations away from the busiest terminals.
What are the three emergency squawk codes?
7500 for unlawful interference, 7600 for radio failure and 7700 for a general emergency. They mean the same thing in every country.
Why do I see squawk 7500 on flight trackers?
The code is broadcast with the aircraft's position, so public trackers can show it as it happens, including brief mistakes that controllers would correct in seconds.
What does squawk 7700 mean?· What does squawk 7600 mean?· Live flight alerts· Recent squawk alerts
When one is near you
The code, named, on the desk.
7700, 7600 and 7500, in words, after the squawk has been seen twice. Made in the UK. Hardware paid once.